/Engine/Plugins/Editor/ContentBrowser/ContentBrowserAssetDataSource/Source/ContentBrowserAssetDataSource/Public/ContentBrowserAssetDataSource.h
Attempt to update the thumbnail associated with the given item.
True if the thumbnail was updated, false otherwise.
virtual bool UpdateThumbnail ( const [FContentBrowserItemData](API\Editor\ContentBrowserData\FContentBrowserItemData) & InItem, [FAssetThumbnail](API\Editor\UnrealEd\FAssetThumbnail) & InThumbnail )